This reminds me of a book Eating for your Blood Type.

It discusses how blood types are originally geographically specific. I have a rare blood type, one that reflects the examples very well. Sicilian and Scananavian. And to connect these geographical dots, the Swedish vikings traveled by boat down the main river into Ukraine , into the Mediterranean, to presumably Sicily. Which might explains my fathers hair color. Might. His mother was of English decent, but I dont think she was blonde.

Yes, the book delves into our natural diets. Diets we lived off for generations and adapted to.

All cool stuff.